Composition for sound-records and other objects.



J. C. ENGLISH. COMPOSITION FOR SOUND RECORDS AND OTHER OBJBO V yAPPLICATION FILED IAB. 24, 1905. 948,31 4.

Paeate Feh, 195,0.

INVENTCR ari-asin JOHN C. ENGLISH, .or cAMDENgNnWiJERsnY,AssmNoR'To-yrc'ron "iarljxrNGm/iaomiin' -.-coMrANY, A-conrone'rronoF'Nnw JERSEY.

e' coMrosITIoi-r. roze soUND-R'nc'onns AND-orner osmosis;

Specification ofrL'ettei's Patent.. I vnizen'lzcd Feel);Apji'iiationaiednareii b4; 1905. .serial No. 251,874. i'

'To all whom it may concer-n:

vented certain new 4and ',uscful I .in'provementsA in Compositions for'Soundliecords and other Objects.

In the manufacti'ircof soundirccords, the

requirements of the compounds which forni.

the body of the records and the reproducing .surface thereof, involve.many' .coii'litioiisl affecting the'action of the .reproducing needle uon the rccordin thezreproduction. of soun s. Amoniri,,theserequirements'are toughness, or' frceldomiroin; cracking andwarping durability, or resistance tothe action o thei'ieedle, which hasa tendency to wear the surface or grooves of the record as the sainepasses through Asaid grooves, fine,

ness of texture ofthe material; which, ifl coarse or gritty, has a.tendency to grind 0r abraile theneedle to' an unduc'extent, and

constancy in a 'degree hardness under all conditions of temperature andmoisture to which a commercial "reoord would ordinarily be subjected.Ordinarily, inV .the-

manufacture of sound records made ofcouipositions of shellac, a bodypigment or filler,

the use lof guni slicllac givesa toughnesswhich has, up to the time ofthis invention,

not been capable of being supplied by any 'other material or gum. The.toughness .of

varnishes, when mixed with body materials or fillers, is due to the oilswhich the varnish contains, andowing to the resencue-,of-

these oils the record is much less urable,.re requircsinuch' eater timeinmanufactnre,

and is liable to' vecome distorted afnd warped,-

to the greater viscosity ,i of the 1 owing varnish.

of s ellac, which, in order to produce t e best results, is usuallyabout forty` .percent byfwcifrht, of the total'ainountof thegmixture.llhe' reduction. of this amount of shellacin these mixtures renders therecord more brittle and liable tovcrack, while at the saine time theabrasive effect upon the needle is greatl increased,

The object, t ercfore, of my invention is to produce such a compositionoi' mixture for use .in sound records, and other objects,

used, but will .also havedistinct advantages 'over theesame. -A .4.1...-

Guin shellac, when 1n itspurest--form and in consistency and color, undit is'th-e aini of manufacturers of record to obtain shellac earthymaterial and =.piginents," require duce the requisite adhesive-,purposeand toughness to the' composition. 'ln thee-usc -wlxiici soun recordsand other objects -req'iiii'ring niatei'ial vhavingt-he=saniez'characteristicsare made.

specificationY is -i lustrated 'a @soundrecord l o. tablet ofthe-disk-ty e 4with the namesl of'- Heretofore ,it 'liasl been` foundthat 'm'ixtures for record material containin ,-vbody' material, such asclay, metallic cxis, .andi similar powders'fandpigments, require an; comaratively large quantity orgper'cei'itafe of certa-'1n hydrocarbons,such-asnitro-naph'-A ne form of the composition WhichiI have found to beespecially satisfactory is a, mixture of about ten per cent. ofnitro-naphthol to ninety per cent. of 4shellac.v This mixture, when-combined with the body material or filler, is-used in the ratioof-about twenty highest grade, resembles well seasoned glue y silica,metallic oxidshand .other cheap of -in'y improved composition, theeinboilij ,nient of. these materials provides a ,niuch sjioio.

.which will not only. have all the advantages i i of the` mixtures ofshellac and the' different body inateiials, whichhave heretofore beenlas .near to this standard 'as possible. 'Of j .course shellac, .whenreceiycdby the users'.

in the regula'rooui-se'of tradefvaries con.. 'Siderably in .the'textureAand quality, and

z. The object, therefore, ofimy invention is toi' enerall 'improvethedmaterial froi'n- In the' drawinv forming apart of thisf-g fi 95 theingredients inscri edthereon', although@ l it is obviousthat myinvention-'is not limit# .5., 'ed toany particular shape or typeoftab'let. Briefly, my.inventioncomprises' the 100 .tholgrbeta-'naphtholg nitro-benul, which I` have found readily'=unitev withshellac and l' ,form asolvent therefor by. the -id' of the" 4 aplication o-heat.

percent. of saidimixture to. eighty `per cent. of said body materialor-filler. It will thus be seen that itis necessary to use only about;

eighteen parts in a hundred of s h'ellac in the resultant com osition,instead of forty parts in a"hundr which has heretoforeI-beetl*necessary. -lt vwill thus' be seen that' .the

amount of s hellac, which is the -Inost eirpensive part of the .recordmateria-Itas greatly reduced, and owin to this reduction in'jthe amountof shellac t e slight variation in the amountrequired `for differentbody materials, or fillers, will not be so noticeable.

AOf course it is obvious that I 1am not limited to the use ofniti'o-naphthol in combina-.

tion with shellac or similar gums,` butl I may .use otherhydrocarbonderivatives of the results produced are the same as with I am aware thatshella'c isfclaimedfto be lsoluble in benzoin, and. after tirst` h'avingbeen treated with borax', *but the c mposi tion which I have invented isentirely dis`=' tin'ct from'. this, as I combine the hydrocar-v bonwhich I u'se .directly with ftli'e shellac l without anyinterinediatelsubstace whichl will produce'the soluble qualities,vOiieof the -particular advantages'bf. my improved ycompositionresidesin tl 1e .fact that the addition of nitro-na )hthol and simi.

lar hydrocarbons, renders t e shellac considerably more iluidunder -theiniiuence of heat, and," therefore, not -only allows. the body o rfiller 'material tc be more iiitiinatel mixed therewith, but also allowsa muc sha1l er and accurate record to be produced.

byt ie pressure 'of the matrix u on'tlie'sur` face'of the-blankffromwhich t e record is .molded or.v stamped, Owing also to -this greaterfiuidit a considerable saving -of time is elfectedI of tlie"'=`.`reco1'dblank to completely enter ald the recesses and minute parts of thegroove.

As above" referred to, further advantages vof my improved compositionreside in .the fact that the reoordmaterial is made much "touglieraridmore lasting, the characteristic of` brittleness being considerablyreduced by the addition'of nitronaphthol, and similarl hydrocarbons. Ihave found that the addi.- tion of nitro-naphthol renders-shella'c of. amorel flexible and whatl might be called a leathery consistency, withoutin:4 any way the solidit 'or elasticity ofthe substance, or vit is welknown in the mannfac- 'ture'of talking machine records, Athat the is'lsolu le.

in lstamping the recoi'ds, 4as itfreqtiires a shorter time for thematerial.

' 'the naphthalene series.

8. In a composition for records for talk'" 'greater body of. thematerial-used and the elasticit of the substance employed, the.l

more e .cient will be the effect-upon the stylusi-or needles ofthereproducingy median-- isin. This,.therefore, is an additional advantage'of m .improved compound, inasmuch Having thus described'my invention,Idol -not wish to. beunderstoo'das being limited to i the precise.ingredients of my improved.' 'compound herein Set `forth, but .the'same ma be varied according to choice and specia requirements, withoutdepart-ing from the spirit andscope' of my invention, but What I claimanddesire to protect by Letters Patent, is,

las the soli4 ity andelasticityis inno way reh the record i'smadelessbrittletliaii 1l In a composition forA molded objects,`

the combinationwith a suitable body material or iiller, of shellac and ahydrocarbon in which said shellac is soluble.

2. In a composition for molded obj ects,V the coinbinationwithf asuitable b odymatei-ial or fller,:o"f shellac and a hydrocarbon of thena hthale-ne series-in which said shellac 3. I n .a composition formolded objects,

the combination with'a suitable body material' or filler, of shellac anda crystalline hydrocarbon of the'naphthalene series-.-

4. In a composition for molded objects the combination with' a suitablebody-material or filler, o shellac and nitro-naphthol.

In acomposition of molded objects .the

combination with a suitable and :Il nitro-hydro carbon.

(. ln a` composition of molded objects the f illei', of shellac combination with a suitable filler, f shellac and a crystalline nitro-hydrocarbon of the naphtha'lcne ser1es.

7. In a composition for records for talking. machines, the' combinationwith a suit able' filler, -of shellac4 and a hydrocarbonlof ingmaclines, the combination-.of a suitable non-wax-like filler or bodymaterial, and a' hydrocarbon of the naphthalene series.'

9. In a composition for recordsfori tal-ke..

ingr machines, the combination of a suitable fil e 4

